Method and system of efficient spectrum utilization by communications satellites

a technology of communication satellites and spectrum utilization, applied in the field of coordinate system of satellite networks, can solve the problems of limited number of satellites that can effectively serve a given area on the earth using a particular band of operation (e.g., “c-band”, “ku-band”), limited growth to higher frequencies, and complex and expensive new systems. to achieve the effect of maximizing the aggregate capability of geosynchronous communications satellites

Inactive Publication Date: 2008-05-20
DIRECTV LLC
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Benefits of technology

[0008]An object of the present invention is to provide a method for maximizing the aggregate capability o

Problems solved by technology

Given the desirability of geostationary satellite orbits and technical limits in spacecraft and earth station design, the number of satellites that can effectively serve a given area on the earth using a particular band of operation (e.g., “C-band”, or “Ku-band”) is limited.
These circumstances have encouraged the development of complex and expensive new systems including those using low Earth orbit (LEO), medium Earth orbit (MEO), and higher frequencies, for example, the Ka band (up to approximately 40 GHz).
Growth to higher frequencies is limited by problems of technology and propagation: thus some efforts at expanding satellite

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  • Method and system of efficient spectrum utilization by communications satellites
  • Method and system of efficient spectrum utilization by communications satellites
  • Method and system of efficient spectrum utilization by communications satellites

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Embodiment Construction

[0023]The present invention is illustrated herein in terms of a system of satellites distributed along a portion of the GSO arc using a tiling pattern covering a portion of the Earth. However, it is to be understood that the invention may also be used with non-GSO satellites. Also, the invention could ultimately be applied to all future GSO satellites. Thus, as GSO satellites are replaced, the teachings of the present invention may be employed to promote frequency reuse and coordinated operation with the replacement satellites.

[0024]The essence of this invention is the establishment of relationships between satellites to maximize spectrum and orbit utilization. These relationships are particularly applicable to the “Fixed Satellite Service” and the “Broadcasting Satellite Service” as defined in the Radio Regulations of the International Telecommunications Union; however, other satellite services may employ these concepts. As described below, optimum relationships are defined in term...

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Abstract

A satellite system includes a plurality of orbit slots having a first orbital and a second orbital slot. A first satellite occupies a first orbital slot and generates a first set of uniform beams. A second satellite located in a second orbital slot generates a second set of uniform beams. A tiling pattern on the face of the Earth has a plurality of cells, with each of the cells having a defined frequency for communication. The first set of beams and the second set of beams are generated according to parameters to avoid interference between them. The parameters may include satellite orbit separations, beam size, multiplicity of band reuse, and ground station received beamwidth.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]The present application is a continuation of prior application Ser. No. 09 / 664,940, filed Sep. 19, 2000 now U.S. Pat. No. 6,810,249, entitled “Method and System of Efficient Spectrum Utilization by Communications Satellites”, inventors: Thomas M. Walsh, George Hrycenko, William J. Nunan and Adam Stone, the entire contents of which are incorporated herein by this reference.TECHNICAL FIELD[0002]The present invention relates to communications satellites, and more particularly, to a coordinated system for satellite networks used to improve frequency reuse.BACKGROUND ART[0003]Satellites in geostationary orbit (GSO) have been widely preferred for several decades because of economic advantages. In a geostationary orbit, a satellite traveling above the Earth's equator, in the same direction as that in which the Earth is rotating, and at the same angular velocity, appears stationary relative to a point on the Earth. These satellites are always “in ...

Claims

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Application Information

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IPC IPC(8): H04Q7/20H04B7/19H04B7/204
CPCH04B7/19H04B7/2041
Inventor WALSH, THOMAS M.HRYCENKO, GEORGENUNAN, WILLIAM J.STONE, ADAM
Owner DIRECTV LLC
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